Chemical Reactions

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What is a chemical reaction?

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A process in which substances (reactants) undergo a transformation to form new substances (products).

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What are reactants in a chemical reaction?

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The starting substances that undergo change during a chemical reaction.

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What are products in a chemical reaction?

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The new substances formed as a result of a chemical reaction.

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What is a coefficient in a chemical equation?

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A number placed in front of a chemical formula to indicate how many molecules or moles of that substance are involved in the reaction.

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What is a subscript in a chemical formula?

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A small number written after an element symbol that indicates the number of atoms of that element in a molecule.

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What is a synthesis reaction?

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A type of chemical reaction where two or more simple substances combine to form a more complex product. Example: @@2H_2 + O_2 ightarrow 2H_2O@@.

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What is a decomposition reaction?

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A type of chemical reaction where a single compound breaks down into two or more simpler products. Example: @@2H_2O ightarrow 2H_2 + O_2@@.

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What is a combustion reaction?

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A type of chemical reaction that occurs when a substance reacts with oxygen, producing heat and light, typically resulting in carbon dioxide and water. Example: @@CH_4 + 2O_2 ightarrow CO_2 + 2H_2O@@.

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What is a double replacement reaction?

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A type of chemical reaction where two compounds exchange ions or bonds to form two new compounds. Example: @@AgNO_3 + NaCl ightarrow AgCl + NaNO_3@@.

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What is the law of conservation of mass?

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A principle stating that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.